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Thread: [GUIDE] Make a Reprogrammable Genesis Cart

  1. #211
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    Quote Originally Posted by Jazzmarazz View Post
    Thread opened by request.



    Sorry I never responded. I must have missed your post. The double posting rule pertains to short periods of time between posts. If no one seems to respond within a week or two, feel free to double post. Also feel free to PM me directly. I like to keep all discussions in this thread for others to find, but I may not see every post even if I would like to.

    Really glad you got your Cotton cart working on your own, you must have learned a bit from that experience.

    As for PS4, it sounds like you are using two different "types" of saving-boards. PS4 uses a large SRAM chip while the original Wily Wars uses a small EEPROM to save. These are not compatible with each other however, There is a patch for the Wily Wars ROM that changes it to use SRAM instead. This makes it compatible with SRAM type boards.
    Yes I just came to the conclusion that PS4 and similar donors must just access save data from different locations within the rom and that is why they are not compatible for saving. As far as Cotton goes it was a learning experience doing pin traces but the game that really required learning was making Golden Axe 3.

    That game has region protection so good that it required me to learn how to put a game genie master region code into the rom using a hex editor. Not only do you have to get the code but you have to convert it to hex and then open the rom and put that hex code into the rom. While not all the difficult once you do it, having no idea what hex code is or ever using a hex editor you are basically flying blind and hoping for the best.

    I have so many of the EA games that are good save donors but I don't have any games that would require a big shell like that and I personally don't like the looks anyhow. Any interest here I plan on unloading them on ebay.

  2. #212
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    Quote Originally Posted by icemanxp300 View Post
    Yes I just came to the conclusion that PS4 and similar donors must just access save data from different locations within the rom and that is why they are not compatible for saving. As far as Cotton goes it was a learning experience doing pin traces but the game that really required learning was making Golden Axe 3.

    That game has region protection so good that it required me to learn how to put a game genie master region code into the rom using a hex editor. Not only do you have to get the code but you have to convert it to hex and then open the rom and put that hex code into the rom. While not all the difficult once you do it, having no idea what hex code is or ever using a hex editor you are basically flying blind and hoping for the best.

    I have so many of the EA games that are good save donors but I don't have any games that would require a big shell like that and I personally don't like the looks anyhow. Any interest here I plan on unloading them on ebay.
    Hahah, hex editing can be daunting. Would you like to upload the modified version of your Golden Axe 3 ROM? I think someone could find it useful. I have never tried getting taht one to work.

    I know what you mean about the large EA carts. They are pretty ugly.

  3. #213
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    Quote Originally Posted by Jazzmarazz View Post
    Hahah, hex editing can be daunting. Would you like to upload the modified version of your Golden Axe 3 ROM? I think someone could find it useful. I have never tried getting taht one to work.
    I can do that, I have got plenty of files from this site. How do you upload it and make sure people know it is a region bypassed version? Here it is, if someone wants it.

    GA3RB.zip
    Last edited by icemanxp300; 3rd-February-2017 at 04:35. Reason: adding file

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  5. #214
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    Quote Originally Posted by icemanxp300 View Post
    I can do that, I have got plenty of files from this site. How do you upload it and make sure people know it is a region bypassed version? Here it is, if someone wants it.

    GA3RB.zip
    Thanks a lot. It looks like the checksum in the header is incorrect though. At least, Kega Fusion says so. What system or version did you run this on? Genesis model 1, 2, 3, Nomad? I think the model 1 and 2 would just display a red screen if the header wasn't fixed. I'll go ahead and fix it in the morning, Im just curious.

  6. #215
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    I test all my games on a tmss model 1. You are correct the checksum was bad. I must have missed that. I generally fix them all.

    Here is a fixed checksum.

    GA3RBFC.zip

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    Hay jazz can check this out tell me what you think thanks in advance .. been trying to make SMB for the Sega Genesis and am not having much luck. The game is 64KB big and I'm suing one of my boards and a 322. So far sprites display and lately the top half of the screen displays. I've tried 'fixing' the checksum and have been stumped so far as to what the issue is. 16427403_1979251898971104_7692601677540778090_n.jpg 16602492_388452951516701_5360164678297588177_o.jpg Capturedsd.PNG Heres ROM used Download Links:
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  8. #217
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    Quote Originally Posted by killapinke View Post
    Hay jazz can check this out tell me what you think thanks in advance .. been trying to make SMB for the Sega Genesis and am not having much luck. The game is 64KB big and I'm suing one of my boards and a 322. So far sprites display and lately the top half of the screen displays. I've tried 'fixing' the checksum and have been stumped so far as to what the issue is. 16427403_1979251898971104_7692601677540778090_n.jpg 16602492_388452951516701_5360164678297588177_o.jpg Capturedsd.PNG Heres ROM used Download Links:
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    I read that facebook post and I thought they said it was working on a different Genesis. It sounds like a coding problem which I couldn't help with.

  9. #218
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    Yeah it works I'm just trying to figure out why it works on some systems and not others.

  10. #219
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    Quote Originally Posted by killapinke View Post
    Yeah it works I'm just trying to figure out why it works on some systems and not others.
    Maybe some of the consoles have TMSS and others do not? Are all of the Genesis consoles official and not clones?

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